In Summer 2002, a 21-yr-old man was found dead one early morning in his apartment. He had been a healthy sportsman, but sometimes he felt an atypical pressure in the left side of his chest, independent of body stress. In all former medical examinations (i.e., electrocardiogram [ECG], stress ECG, and echocardiography), particularly in the armed forces, no pathological diagnosis had been found. The gross specimen showed an anomaly of his coronary arteries: the right coronary artery (RCA) had its origin out of the left sinus of Valsalva and showed a so-called interarterial course, between aorta and pulmonary artery.